text: importScripts('https://storage.googleapis.com/workbox-cdn/releases/5.1.2/workbox-sw.js');
  
  workbox.setConfig({
    debug: true,
  });
  
  workbox.precaching.precacheAndRoute([
    {url: '/', revision: '2'},
    {url: 'test-file.txt', revision: '2'},
    'hello-world.5678.txt',
  ]);
  